This document describes how to install a PureFTPd server that uses virtual users from a MySQL database instead of real system users. This is much more performant and allows to have thousands of ftp users on a single machine. In addition to that I will show the use of quota and upload/download bandwidth limits with this setup. Passwords will be stored encrypted as MD5 strings in the database.
http://www.howtoforge.com/virtual-hosting-with-pureftpd-mysql-on-debian-lenny
http://techwebinarmaven.com/s/632.load-balancing-in-virtual-server-environments/
No good deed goes unpunished, especially when it comes to IT. As server utilization rates increase thanks to virtualization, the network tends to get punished because where there was once, for example, ten servers there are now 100 virtual servers.
In a Learn How to Virtualize Mission-Critical Applications with VMware and F5 webinar sponsored by F5 Networks and VMware, how to balance application loads across virtual servers is squarely addressed.
Charlie Cano, solution architect for F5 Networks, and Sanjay Aiyagari, a senior partner solutions manager for VMware, take turns discussing how to optimize network traffic using F5 Network appliances that have been tuned to support new VMware technologies, such as AppSpeed, and existing VMware capabilities, such as the Distributed Resource Scheduler.
For instance, F5 Network has added the ability for its products to not only tell VMware that a new virtual machine needs to be spun up, but then also automatically balance network traffic to accommodate that new instance of a virtual machine.
Overall, Cano says the use of F5 Network appliances can result in anywhere from 30 to 50 percent more virtual machine density per physical server because of all the tasks have been offloaded to the F5 Network appliances.
